下面用简短的代码说明在最常见的public继承情况下访问权限的变化

#include <iostream>
using namespace std;

class A
{
public:
	A():a(0),b(0),c(0){}

	int get_a(void ){return a;}
	int a;
protected:
	int get_b(void) {return b;}
	int b;
private:
	int get_c(void) {return c;}
	int c;
};

class B : public A
{
public:
	B():aaa(0),bbb(0),ccc(0){}

	int get_aaa(void ){return aaa;}
	int aaa;
	int get_b(void){return A::get_b() + b;}
protected:
	int get_bbb(void){return bbb;}
	int bbb;
private:
	int get_ccc(void){return ccc;}
	int ccc;
};

void print(int n)
{
	cout<<n<<endl;
}

int main(int argc, char* argv[])
{
	B object;
	print(object.a);
	print(object.aaa);
	print(object.get_a());
	print(object.get_aaa());
	print(object.get_b());
	

	return 0;
};

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C++派生类的访问权限,布布扣,bubuko.com

C++派生类的访问权限